Ok so I have my new Trex 700e 3g all ready to maiden in the morning but I now have a concern i was triple checking everything and noticed the BEC was extreamly hot is this normal for this BEC? it is the align K10382A that came with the super combo.

on no sorry I am running a 2s2200mah lipo through it for the servos and then 2 6s 5000mah in series for the motor so the only thing hooke to the external bec is a single 2s

Then something is still causing resistance. It could be a servo or you may try a different bec. Probably the least expensive part to change out.

BTW, you did not say how big your bec is, 3a 5v?

Sorry re-read your question and you gave the bec part # so I would say that is the problem......or....a lipo that can't keep up with what it needs.

Any servo's warm?

Also, this is just a n00b thought but some of the reason for the bec is to "take the heat" and not have it go through the esc but re-re-reading your post you said extremely hot. That is bad. If you can't hold your finger on it and count 1-2-3. Replace it.

Then something is still causing resistance. It could be a servo or you may try a different bec. Probably the least expensive part to change out.

BTW, you did not say how big your bec is, 3a 5v?

Sorry re-read your question and you gave the bec part # so I would say that is the problem......or....a lipo that can't keep up with what it needs.

Any servo's warm?

Also, this is just a n00b thought but some of the reason for the bec is to "take the heat" and not have it go through the esc but re-re-reading your post you said extremely hot. That is bad. If you can't hold your finger on it and count 1-2-3. Replace it.

yes extremely hot as in melted the factory heat shrink I will go and feel the servos but i didn't notice any of them getting warm guess the align bec is crap

That align bec is a linear bec which do get much hotter than a switching bec. How about just using a voltage regulator like a duralite, scott grey reactor or similar? There is also the CC BEC.

The Align is rated for 6amps, the CC BEC for 10amps, the CC BEC Pro for 20 amps, the duralite for 7.5amps and the scott grey for 15amps. Even though the duralite and scott grey are rated lower I would choose them over an align or castle. You've got a really expensive heli there, don't jeapordize it due to a $25 bec....

A couple of things: Some servos can't take the 6v that that BEC puts out -- they talk about putting a drop-down resistor (or something) in line if that's the case.

But personally I would never use a linear BEC like that one for anything. A switching BEC, like the CC devices mentioned in post #6, run much cooler and are much more likely to be able to deliver the amps reliably. They can also run off your motor battery, so no need for a separate 2S LiPo. I don't know about CC, but many of them are also switchable between 5v and 6v output.

A couple of things: Some servos can't take the 6v that that BEC puts out -- they talk about putting a drop-down resistor (or something) in line if that's the case.

But personally I would never use a linear BEC like that one for anything. A switching BEC, like the CC devices mentioned in post #6, run much cooler and are much more likely to be able to deliver the amps reliably. They can also run off your motor battery, so no need for a separate 2S LiPo. I don't know about CC, but many of them are also switchable between 5v and 6v output.

acording to the manual only the rudder servo cant handle the 6v so I have a 5.1V Two-way Step-down Voltage Regulator going to the rubber servo.

acording to the manual only the rudder servo cant handle the 6v so I have a 5.1V Two-way Step-down Voltage Regulator going to the rubber servo.

that's fine but I really would suggest replacing the align bec but don't suggest running off the main battery. if for what ever reason, your main battery when down, you'd still have power off the receiver battery to do an auto.

that's fine but I really would suggest replacing the align bec but don't suggest running off the main battery. if for what ever reason, your main battery when down, you'd still have power off the receiver battery to do an auto.

I think that argument can run both ways: The separate receiver battery could go down just as easy as the main battery -- happened to a friend of mine at the field last week

If the tail servo can't take 6v, I would also be looking at do the other servos and receiver really need 6v, or can they run just fine on 5v? If so, reduce the complication by getting a switching BEC and setting it to 5v to run the whole lot.

I think that argument can run both ways: The separate receiver battery could go down just as easy as the main battery -- happened to a friend of mine at the field last week

If the tail servo can't take 6v, I would also be looking at do the other servos and receiver really need 6v, or can they run just fine on 5v? If so, reduce the complication by getting a switching BEC and setting it to 5v to run the whole lot.

You're right, it can but I prefer not to load the bec to go from 22.2v to 6v. I like the idea of 7.4v to 6v. Also, did the battery actually fail or did he forget to charge it?

Hell, I prefer using LiFeP04 packs and not having to use a bec or regulator at all.

The OP's question is why his BEC is running hot, not why he should run an external 2s lipo or liFe should be used.

Back to the question ... it appears there may be defects to the BEC which caused it to run so hot that the heat shrink was melted. This particular BEC has an alumnium cover plate that is being held in place by double-side tape and the clear heat shrink. The al. plate could have shifted during assembling process thus caused it shortout.

The OP's question is why his BEC is running hot, not why he should run an external 2s lipo or liFe should be used.

Back to the question ... it appears there may be defects to the BEC which caused it to run so hot that the heat shrink was melted. This particular BEC has an alumnium cover plate that is being held in place by double-side tape and the clear heat shrink. The al. plate could have shifted during assembling process thus caused it shortout.

I've already posted on the topic so please maybe read the entire thread before jumping on someone?

Ok so I have my new Trex 700e 3g all ready to maiden in the morning but I now have a concern i was triple checking everything and noticed the BEC was extreamly hot is this normal for this BEC? it is the align K10382A that came with the super combo.